If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

why number 8549176320 is one of a kind?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

What is harder to catch the faster you run?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

They are three errirs in this question. Can you find them?

What word is represented by this rebus?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What four weights can be used to balance from 1 to 30 pounds?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?